I never seen one that looked like that. Do you know how i'd go about putting a threaded shift knob on ? I think the standard one is press fitted on but not sure.Bad News Racing has this: http://store.badnewsracing.net/2016-M32-Short-Shifter-Q2-Shift_p_561.html although I believe it uses a different transmission.
(edit) This looks like what would work. https://www.ebay.fr/itm/4H-Tech-Q2-...Astra-K-1-6-CDTi-05-2016-Models-/322545513281